//ATTENTION: Long running task. If you are going to run a sync after this update run first 
//db.ReferenceUniverse.remove( { Name: { $ne: "Default" } } )
use ClientDW_A
    db.PeerGroup.update({}, {$unset: {RootPeerGroupId:1}}, false, true)
    db.RootPeerGroup.drop()
use ClientDW_B
    db.PeerGroup.update({}, {$unset: {RootPeerGroupId:1}}, false, true)
    db.RootPeerGroup.drop()